PLCs: Advantages - Reliability
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Questions and Answers

What is a PLC?

  • A specialized electronic device for controlling industrial machinery (correct)
  • A household appliance
  • A type of smartphone
  • A type of personal computer

    • In PLCs, what do the five standard programming languages refer to?

  • Five programming languages defined in IEC 61131 standard (correct)
  • Five types of sensors used in PLCs
  • Five different communication protocols in PLCs
  • Five different types of hardware used in PLCs

    • What is a key advantage of PLCs in terms of reliability?

  • They are made of fragile components
  • They are prone to frequent breakdowns
  • They are industrial computers that operate in harsh environments (correct)
  • They can only operate in controlled environments

    • How do PLCs benefit maintenance and troubleshooting processes?

    <p>They simplify maintenance and troubleshooting tasks</p> Signup and view all the answers

    What are PLCs mainly used for in industrial settings?

    <p>Controlling manufacturing machines and systems</p> Signup and view all the answers

    Which standard specifies the five programming languages commonly used in PLCs?

    <p>IEC 61131</p> Signup and view all the answers

    What is a key advantage of PLCs over relays when it comes to reliability?

    <p>PLCs do not require physical wear like relays do.</p> Signup and view all the answers

    How does off-line programming of PLCs differ from installing and modifying RLL circuits?

    <p>Off-line programming can be completed in minutes while installing RLL circuits takes days or weeks.</p> Signup and view all the answers

    In ladder logic, what does each rung represent?

    <p>A logical statement executed in software</p> Signup and view all the answers

    In on-line programming with PLCs, what can be edited while the PLC controls the production system?

    <p>The ladder logic program</p> Signup and view all the answers

    What is the limitation on the number of virtual relays and input/output instructions in a PLC?

    <p>Memory size</p> Signup and view all the answers

    How do PLC input instructions differ from ladder logic switches?

    <p>PLC input instructions are logical symbols associated with voltage at input module terminals</p> Signup and view all the answers

    Why is maintenance and troubleshooting easier with PLCs compared to traditional relay control systems?

    <p>Changing a module or processor in a PLC does not require any wiring changes.</p> Signup and view all the answers

    What is a key advantage of using separate power sources for PLC input and output devices?

    <p>Increased isolation from processor power</p> Signup and view all the answers

    What is a significant advantage of using PLCs in a production system with varying requirements?

    <p>PLCs can control many different applications with only program and module changes.</p> Signup and view all the answers

    Which characteristic of PLCs contributes significantly to their reliability compared to relay systems?

    <p>Reliability inherent in electronic devices</p> Signup and view all the answers

    Which statement best describes the PLC rung output in ladder logic?

    <p>It is a discrete output instruction or bit in memory</p> Signup and view all the answers

    Why can outputs be paralleled on the same rung in ladder logic programming?

    <p>To simplify wiring modifications</p> Signup and view all the answers

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